ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29c1cccc2nc%28OCC%29n%28c12%29Cc5ccc%28c3ccccc3c4nnnn4%29cc5/file?format=sdf&get3d=True  -- O%3DC%28O%29c1cccc2nc%28OCC%29n%28c12%29Cc5ccc%28c3ccccc3c4nnnn4%29cc5 could not be loaded.